linux-kernel - Re: [RESEND PATCH v5 3/5] acerhdf: Use bang-bang thermal governor

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Date:	Thu, 4 Dec 2014 03:18:13 -0800
From:	Darren Hart <dvhart@...radead.org>
To:	Peter Feuerer <peter@...e.net>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	platform-driver-x86@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Zhang Rui <rui.zhang@...el.com>, Andreas Mohr <andi@...as.de>,
	Javi Merino <javi.merino@....com>
Subject: Re: [RESEND PATCH v5 3/5] acerhdf: Use bang-bang thermal governor

On Mon, Dec 08, 2014 at 08:45:58AM +0100, Peter Feuerer wrote:
> Hi Darren,
> 
> I know you are busy and I don't want to stress you, but have you had time to
> look to this?  I'd be really happy to solve all issues in time and have
> those patches finally applied.

Not yet. I've been traveling to Mexico and wrapping up the current for-next
patches. FYI, also dealing with a very sick kid these last couple of days, so
I've been rather tied up. I hope to get to these in the next few days.

You've provided the link to the discussion which is what I needed, thanks.

Thanks,

Darren

> 
> kind regards,
> --peter;
> 
> 
> Peter Feuerer writes:
> 
> >Hi again,
> >
> >Peter Feuerer writes:
> >
> >>Hi Darren,
> >>
> >>thank you very much for your reply.
> >>
> >>
> >>Darren Hart writes:
> >>
> >>>On Fri, Nov 28, 2014 at 03:20:50PM +0100, Peter Feuerer wrote:
> >>>>acerhdf has been doing an on-off fan control using hysteresis by
> >>>>post-manipulating the outcome of thermal subsystem trip point handling.
> >>>>This patch enables acerhdf to use the bang-bang governor, which is
> >>>>intended for on-off controlled fans.
> >>>>
> >>>>Cc: platform-driver-x86@...r.kernel.org
> >>>>Cc: Darren Hart <dvhart@...radead.org>
> >>>>Cc: Andrew Morton <akpm@...ux-foundation.org>
> >>>>CC: Zhang Rui <rui.zhang@...el.com>
> >>>>Cc: Andreas Mohr <andi@...as.de>
> >>>>Cc: Javi Merino <javi.merino@....com>
> >>>>Acked-and-tested-by: Borislav Petkov <bp@...e.de>
> >>>>Signed-off-by: Peter Feuerer <peter@...e.net>
> >>>>---
> >>>> drivers/platform/x86/Kconfig   |  3 ++-
> >>>> drivers/platform/x86/acerhdf.c | 36 +++++++++++++++++++++++++++++++-----
> >>>> 2 files changed, 33 insertions(+), 6 deletions(-)
> >>>>
> >>>>diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> >>>>index a2eabe6..c173266 100644
> >>>>--- a/drivers/platform/x86/Kconfig
> >>>>+++ b/drivers/platform/x86/Kconfig
> >>>>@@ -38,7 +38,8 @@ config ACER_WMI
> >>>> config ACERHDF
> >>>> 	tristate "Acer Aspire One temperature and fan driver"
> >>>>-	depends on THERMAL && ACPI
> >>>>+	select THERMAL_GOV_BANG_BANG
> >>>
> >>>So we use select sparingly as it does implicit things.
> >>>
> >>>I checked the THERMAL_GOV_BANG_BANG Kconfig entry, and the help says acerhdf
> >>>already depends on it (which it doesn't appear to). Any particular reason to add
> >>>select here instead of adding it as a depends.
> >>>
> >>>Why did you drop THERMAL?
> >>
> >>I had it like this in my first version of patches:
> >>+ depends on THERMAL && ACPI && THERMAL_GOV_BANG_BANG
> >>
> >>But after some discussion with lkml community we ended up with the
> >>select line and dropped THERMAL dependency, as it is implied by
> >>THEMAL_GOV_BANG_BANG.  I'm not so experienced with Kconfig, so I must
> >>rely on the statements of the community in this case.
> >
> >Just found the link about this discussion I had with Rui and Boris:
> >http://linux-kernel.2935.n7.nabble.com/PATCH-0-4-acerhdf-thermal-adding-new-models-and-appropriate-governor-tp848572p908256.html
> >
> >[...]
> >
> >-- 
> >kind regards,
> >--peter;
> 

-- 
Darren Hart
Intel Open Source Technology Center
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